Multi-mode Sensor Readout Circuit for DIRCM
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Solution Overview
Problem
There is a need for lightweight, low-cost, efficient directed infrared countermeasure (DIRCM) systems to address missile threats, but existing technologies face numerous challenges in meeting performance criteria such as high-speed data readout, seamless mode transitions, and power management.
Innovation Solution
A multi-mode sensor system capable of both passive and active infrared operation, featuring a digital read-out-integrated circuit (ROIC) with high-speed data readout, time delay integration, and power management optimization, allowing for seamless transitions between modes and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple rows of the sensor array are readout simultaneously using additional column cells and multiplexers, then the data readout speed is improved, but the device complexity increases
Solution Approach 1:
The sensor array is divided into multiple banks, with each bank having its own dedicated readout circuitry including column cells and multiplexers. This segmentation allows parallel readout of multiple rows while maintaining manageable complexity within each bank, resolving the contradiction between speed and complexity.
Solution Approach 2:
The patent introduces a temporal dimension to the readout process by implementing multi-phase clocking and sequential activation of different column cell groups. This allows multiple rows to be readout simultaneously across different time phases, achieving high speed readout without requiring all column cells to operate at full complexity simultaneously.
2Adaptability or versatility
If the sensor system supports both passive and active infrared operation modes, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The sensor array and readout circuitry are designed with universal functionality to support both passive infrared detection and active infrared illumination modes. The same hardware infrastructure serves multiple purposes, achieving versatility without proportionally increasing complexity.
Solution Approach 2:
The system implements dynamic reconfiguration capabilities where the sensor array can switch between passive and active modes through controllable elements such as variable gain amplifiers and selectable readout paths. This dynamic adaptability allows the system to optimize performance for each mode while using the same physical hardware.
3Productivity
If a subset of pixels is used for active mode with different column cell configurations, then the productivity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
Different regions of the sensor array are assigned different functional characteristics - the central region uses column cells optimized for active mode with higher frame rates, while peripheral regions use standard configuration. This local differentiation allows high productivity in the active mode region without requiring the entire array to meet stringent manufacturing precision requirements.
Solution Approach 2:
The patent applies enhanced readout capabilities (additional column cells, faster sampling) only to the subset of pixels needed for active mode operation, rather than uniformly across the entire array. This partial application of enhanced features achieves high productivity where needed while reducing overall manufacturing complexity and precision requirements.
Data Source
AI summary
Techniques are disclosed that provide a multi-mode sensor having the capability to support both passive and active operation. One embodiment provides a sensor readout device for operation with a sensor array having rows and columns of detectors. The device includes a column cell for receiving a detector output signal from a first row of a column of the sensor array, and an additional column cell. The device further includes a multiplexer configured to steer a detector output signal from a second row of the column of the sensor array to the additional column cell, thereby allowing multiple rows of the sensor array to be readout simultaneously. In some cases, the sensor array includes an active/passive dual mode central windowed area, and the multiplexer allows columns of the windowed area to be readout at two or more speeds.